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    May 2016
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    United Arab Emirates

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  1. To all the students in the 2014-2016 batch for the IB. We had a Predicted Grade examination 3 weeks ago and it went quite okay, except for few subjects like Math and Physics. I wanted to know how did the students in dubai and abroad felt of the examination and how was the portions for the exams? This is the May 2015 predicted Grades examinations........
  2. Guys, I want to know how did Physics HL and maths HL go for the students in dubai and abroad? Was the portion sufficient or did they give you excess for the exam?
  3. , where a, b, c, d are real numbers Given that 1 + i and 1 − 2i are zeros of the above polynomial, find the values of a, b, c and d. I'm having tough time as this is very long in solving. Could anyone help out in doing this? So if 1+i is a zero, that means 1-i is a zero as well right? so (x-1-i) and (x-1+i) are factors Now, 1-2i is a zero so 1+2i is a zero as well, so (x-1+2i) and (x-1-2i) are factors So now, the polynomial is (x-1-i)(x-1+i)(x-1+2i)(x-1-2i) One way to expand them is to group them like this --> [(x-1)-i][(x-1)+i] [(x-1)+2i][(x-1)-2i] Now you can expand the first two and last two using (a-b)(a+b) = a^2 - b^2 so this is [(x-1)^2 -i^2] [(x-1)^2 - 4i^2] = (x^2 - 2x + 1 + 1)(x^2 - 2x + 1 + 4) = (x^2 - 2x + 2)(x^2 - 2x + 5) now expand this out = x^4 - 2x^3 + 5x^2 - 2x^3 +4x^2 - 10x + 2x^2 -4x + 10 = x^4 - 4x^3 + 11x^2 - 4x + 10 Hope this helped Thanks!!! I made a small mistake in the factors thing.
  4. . [7 marks] Consider the polynomial , where a, b, c, d are real numbers Given that 1 + i and 1 − 2i are zeros of the above polynomial, find the values of a, b, c and d. I'm having tough time as this is very long in solving. Could anyone help out in doing this?
  5. Guys, How do I find the integral of (secx - tanx)^2 ?????
  6. You're thesis statement must be concise, accurate and specific and also straight to the point. It must convey the idea you are intending to display. And the point of a thesis statement is to either prove it or disprove it. If you could show me the literature intro here, I could help you further in formulating one. And is its literature, remember this sequence always in an analysis: Thesis statement produced --> Evidence in the context --> Effects produced by that. This is how you should be doing any analysis or a written assignment.
  7. Thanks man, I was stuck after the integral step. I didn't know the constant would be zero, but yeah appreciate the assist by the way.
  8. Guys, I need a little help in this question, The curve y=f(x) that passes through the origin. Given the f '(x)= 3x^2-8x-5. Find the coordinates of the other points where the curve crosses the x-axis. Could you help, cause im completely off ideas on this one
  9. Well, my EE supervisor suggested that you may exceed 4000 words but with a minimal margin. You could exceed to 4050-4100, but they round it up to 4000. but not exceeding to 4200+
  10. I think before you begin, you must first research on all the authentic sites so that you can research for a full 2-year report. And, to be honest math is really difficult to score for an EE research work. Coz you have to write 4000 words which are not easy to accomplish in a subject like Maths.... But it is up to you to decide whether you want to opt for it or no.
  11. Well, in the end it is all up to you to decide on the topic you want to focus on. There are incidents where people get an A in Econs. But when you choose an EE topic, it must be a topic of your liking. Generally, Physics is the least scoring subject as the criteria and expectations are very different from other subjects. Econ is kind of easy as it dosen't require any experimentation or setup. You could go around speculate the company's shares for example. Or the tax rates and its variations and its dependency on various factors. These are examples, so just try brainstorming and you might get good ideas.
  12. I don't know whether this is a calculator question or not. But i'll assume it's not. Here is my full worked solution (pay attention to the stuff that I typed in bold): Untitled.png I realized that the last part looks rather complicated. To be honest, you can simply sketch f(x) based on intuition. However if you want to see the mathematical reasoning behind it, then just look at my solution. If there's anything unclear, feel free to ask! This was a great help to me as I was stuck in the graph question, cause it was rather complicated. But, I viewed through graphs and agree with the conclusive answer you provided
  13. I like the the subject, so probably on the other side of TOK. Cause it enables us to challenge the worlds conventions and to think independently and differently. There is no right or wrong answer and this is the merit and a demerit of the subject. But in the end its your attitude towards the subject that decides your liking.
  14. Is this for an experimental or a theoretical EE? I'm assuming this is for a physics EE. "How does the speed of air currents and the number of blades affect the rotational velocity and the power outage of the wind turbines?" could work, although it's messy. Also, are you sure that you can fit all that into your EE? Yah, I have formulated my RQ and compacted and used a different variable. So, instead of the quantity of blades I'm going with the shape of the blade; and this is a very promising variable. So, my RQ is How does the blade design of a wind turbine affect its rotational velocity and power output? Sounds interesting! Good luck with your EE Thanks and Good luck for your exams (I think?) it says exams in May 2015
  15. (b) The function f is defined by f (x) = x2 + 4 cos x for 0 < x < π. (i) By considering the graphs of y = x and y = 2 sin x, show that f (x) has only one stationary point, and explain why this stationary point is between pi/2 and π. (ii) Find f ″(x) and hence prove that the stationary point is a minimum. (iii) Find the coordinates of the point of inflection on the graph of y = f (x). (iv) Sketch the graph of y = f (x), clearly labelling the stationary point and the point of inflection. I have found the answer, but im not sure whether its right.
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